At least 40 people were killed and another 30 may still be under the rubble after Monday's attack on a Ukrainian village, Kyiv says.

Herzog warned politicians that "not every commitment and promise can be fulfilled" if they want to avoid another election.

Critics say the move comes too late, that the files themselves are incomplete, and the move risks sowing division and causing unnecessary anguish.

Russian and Ukrainian delegations will meet the US first lady at the White House on Thursday.